Rotary engine.



PATBNTED DEC. 19, 1905. J. B; STUMPP.

ROTARY ENGINE APPLICATION FILED MAY 17. 1905.

O O lg [NVENTOR 0% ii /W M /m m6.-

A 110m yd.

PATENT ()FFICE.

JOHN B. STUMPF, OF KALAMAZOO, MICHIGAN.

ROTARY ENGINE.

Specification of Letters Patent.

Patented. Dec. 19, 1905.

Application filed May 17, 1905. Serial No. 260,825-

To all whom it may concern:

Be it known that I, JOHN B. STUMPF, a citizen of the United States,residing at Kalamazoo, in the county of Kalamazoo and State of Michigan,have invented new and useful Improvements in Rotary Engines, of whichthe following is a specification.

This invention relates to a rotary impactengine which may be driven bysteam, compressed air, or other fluids of any kind, the deviceconsisting of a very simple, compact, and durable mechanism which formsan engine of very low cost, and owing to its simplicity it is easilyoperated and requires but little repairing.

In the accompanying drawings, Figure 1 is an end elevation of the enginewith one end of the cylinder removed. Fig. 2 is a side view of thepiston removed from the cylinder. Fig. 3 is a perspective of the end orcover of the cylinder removed.

Referring specifically to the drawings, 6 in dicates a cylindricalcasing, 7 being the removable ends on same. The piston rotates in thiscasing. The piston consists of blades 8, mounted on or extending fromthe hub 9 on the shaft 10. These blades are arranged alternately on thehub or are staggered and are of less width than the cylinder, so as toprovide passages around the inner edge of the blade from one blade tothe next, thus making a series of alternate passages around the hub inthe cylinder. The blades extend approximately each two-thirds across thespace between the heads or ends of cylinder, thus leaving a passage ofone-third the space between the heads. The hub 9 is preferably octagonalin crosssection, around which are arranged eight blades but any othernumber or shape may be employed. The blades 8 are attached to the hub bybeing inserted in grooves in the hub, as shown in Fig. 2 at 11; but theymay be bolted onto flanges or secured in other ways. While the bladescould be cast on, I prefer to employ thin blades of steel attached inthe manner shown. The blades are set at an acute angle to the axis ofthe shaft,with the alternate blades oppositely, so that they inclinetoward each other, and the motive fluid is thereby caused to rebound orflow from one blade to the next, striking the same at a fair angle toexert a powerful impact, and so on around the piston.

The shaft 10 has suitable hearings on the heads of the cylinder. Aninlet-pipe for admitting steamto cylinder is indicated at 12 and ofcourse has suitable valve for control ling the same. The inlet-pipeenters the cylinder near the top thereof and delivers the motive fluidtangentially to the blades. 13 is the exhaust-pipe, leading from theside of cylinder just below the inlet, so that the fluid traversesnearly the entire circumference of the cylinder.

It will be seen from the foregoing description that I provide averysimple and effective engine having a small number of parts, andconsequently being easily understood and operated by any one. The engineis adapted to run at a very high rate of speed when desired and is avery effective motor for running boats, vessels, vehicles, &c., and mayalso be used for any industrial purpose.

I/Vhat I claim as new, and desire to secure by Letters Patent, is

1. In a rotary engine, in combination, a cylinder having circumferentialinlet and outlet, a shaft extending across the cylinder, and a piston onthe shaft comprising a plurality of blades mounted on the shaft at anacute angle to the axis thereof and staggered with respect to each otherand in contact alternately with the heads of the cylinder.

2. In a rotary engine,the combination with the cylinder having atangential inlet, and an exhaust, of a shaft therein, and a pistoncomprising a plurality of blades mounted on the shaft atalternately-opposite angles to each other, said blades being of lessWidth than the space between the heads of the cylinder and staggered toalternately contact with said heads.

3. In a rotary engine, in combination, a shaft, a hub thereon havinggrooves at alternately-opposite angles to the axis of the shaft, andblades fixed in said grooves.

In testimony whereof I have signed my name to this specification in thepresence of tWo subscribing witnesses.

JOHN B. STUMPF.

Witnesses:

OTTO IBLING, HENRY W. BUEOHNER.

